Cooler



FIG. 1 is a top front right side perspective view of a cooler showing our new design;

FIG. 2 is a right side elevational view thereof (the left side is a mirror image of FIG. 2 );

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a top plan view thereof.

The broken lines in all views are for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for a cooler, as shown and described. 